Add framerate to VideoSinkWants and ability to signal on overuse

webrtc/media/base/videobroadcaster.cc

Index: webrtc/media/base/videobroadcaster.cc
diff --git a/webrtc/media/base/videobroadcaster.cc b/webrtc/media/base/videobroadcaster.cc
index 5d0edeb6dfe4f9dc3129ba19231716f8caea03f5..8986de15bc8708b5a3dcccb0039e90d56681df33 100644
--- a/webrtc/media/base/videobroadcaster.cc
+++ b/webrtc/media/base/videobroadcaster.cc
@@ -98,6 +98,12 @@ void VideoBroadcaster::UpdateWants() {
          (*sink.wants.target_pixel_count < *wants.target_pixel_count))) {
       wants.target_pixel_count = sink.wants.target_pixel_count;
     }
+    // Select the minimum for the requested max framerates.
+    if (sink.wants.max_framerate_fps_ &&
+        (!wants.max_framerate_fps_ ||
+         (*sink.wants.max_framerate_fps_ < *wants.max_framerate_fps_))) {
+      wants.max_framerate_fps_ = sink.wants.max_framerate_fps_;
+    }
   }
 
   if (wants.max_pixel_count && wants.target_pixel_count &&